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Question: Volcanoes. Almost every year, there is some incidence of volcanic activity on the island of Japan. In 2005 there were 5 volcanic episodes, defined as either eruptions or sizable seismic activity. Suppose the mean number of episodes is 2.4 per year. Let X be the number of episodes in the 2-year period 2008 2009.
a) What model might you use to model X?
b) What is the mean number of episodes in this period?
c) What is the probability that there will be no episodes in this period?
d) What is the probability that there are more than three episodes in this period?
the bureau of the census reports that the average commuting time for citizens of both baltimore maryland and miami
Assuming that the heights of college women are normally distributed, with a mean of 69 inches and standard deviation of 4.8 in, what is the percentage of women that are between 69 in. and 73.8 in.?
The supplier claims that no more than 2% of the items in the shipment are defective. Carry out an appropriate hypothesis test and comment on the credibility of the supplier's claim.
What is their maximum error of the estimated mean quality for a 92% level of confidence and an estimated standard deviation of 8?
Assume a normal distribution applies and alpha = 0.05 (Use Z table), find the Critical value for the alternative hypothesis:
Data collection instrument used in managerial research. Why is it significant to make sure that these data collection methods and instruments are both reliable and valid?
What is the point estimate of the difference between the population mean expenditure for males and the population means expenditure for females?
What is the difference between statistical significance and practical significance?- Discuss the reasons that a researcher might obtain non significant results.
For a simple random sample of ten patients who have recently had knee surgery, the scores are as follows: 101, 92, 94, 88, 52, 93, 76, 84, 72, and 98. Construct and interpret the 90% and 95% confidence intervals for the population mean.
Find the 95% confidence interval for the true population mean. Identify the point estimate for mean and margin of error.
Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
A woman who weighs 250 N stands on an 8 m long board that weighs 100 N. The board is supported at each end. The support force at the right end is 3 times bigger than the support force at the left end. How far from the right end is the woman standi..
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